<template>
    <div>
      <!-- 面包屑导航区域 -->
      <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>添加商品</el-breadcrumb-item>
      </el-breadcrumb>

      <!-- 卡片视图区域 -->
      <el-card class="box-card">
        <!-- 提示区域 -->
        <el-alert title="添加商品信息" type="info" show-icon center :closable="false">
        </el-alert>
        <!-- 步骤条区域 -->
        <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
          <el-step title="基本信息"></el-step>
          <el-step title="商品参数"></el-step>
          <el-step title="商品属性"></el-step>
          <el-step title="商品图片"></el-step>
          <el-step title="商品内容"></el-step>
          <el-step title="完成"></el-step>
        </el-steps>

        <!-- tab栏区域 -->
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
          <el-tabs tab-position="left" v-model="activeIndex" :before-leave="beforeTabLeave" @tab-click="tabClicked">
            <el-tab-pane label="基本信息" name="0">
              <el-form-item label="商品名称" prop="goods_name">
                <el-input v-model="addForm.goods_name"></el-input>
              </el-form-item>
              <el-form-item label="商品价格" prop="goods_price">
                <el-input v-model="addForm.goods_price" type="number"></el-input>
              </el-form-item>
              <el-form-item label="商品重量" prop="goods_weight">
                <el-input v-model="addForm.goods_weight" type="number"></el-input>
              </el-form-item>
              <el-form-item label="商品数量" prop="goods_number">
                <el-input v-model="addForm.goods_number" type="number"></el-input>
              </el-form-item>
              <el-form-item label="商品分类" prop="goods_cat">
                <el-cascader v-model="addForm.goods_cat" :options="cateList" :props="cascaderProps" @change="handleCascaderChanged" clearable></el-cascader>
              </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品参数" name="1">
              <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                <el-checkbox-group v-model="item.attr_vals">
                  <el-checkbox :label="fxk" v-for="(fxk, idx) in item.attr_vals" :key="idx" border></el-checkbox>
                </el-checkbox-group>
              </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品属性" name="2">
              <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                <el-input v-model="item.attr_vals"></el-input>
              </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品图片" name="3">
              <el-upload :action="uploadURL" :on-preview="handlePreview" :on-remove="handleRemove" list-type="picture" :headers="headersObj" :on-success="handleSuccess">
                <el-button size="small" type="primary">点击上传</el-button>
              </el-upload>
            </el-tab-pane>
            <el-tab-pane label="商品内容" name="4">
              <quill-editor :v-model="addForm.goods_introduce" />
              <el-button type="primary" @click="addGoods" class="addBtn">新增商品</el-button>
            </el-tab-pane>
          </el-tabs>
        </el-form>
      </el-card>

      <!-- 图片预览 -->
      <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
        <img :src="previewPath" alt="" class="previewImg">
      </el-dialog>
    </div>
</template>

<script>
var _ = require('lodash')
export default {
  data () {
    return {
      activeIndex: '0',
      // 添加商品的表单数据对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        goods_cat: [1, 3, 6],
        pics: [],
        // 商品的详情描述
        goods_introduce: '',
        attrs: []
      },
      // 添加商品的表单的验证规则对象
      addFormRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' }
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' }
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' }
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' }
        ],
        goods_cat: [
          { required: true, message: '请选择商品分类', trigger: 'blur' }
        ]
      },
      // 商品分类列表
      cateList: [],
      // 指定级联选择器的配置对象
      cascaderProps: {
        expandTrigger: 'hover',
        checkStrictly: true,
        value: 'cat_id',
        label: 'cat_name'
      },
      // 动态参数列表数据
      manyTableData: [],
      // 静态属性列表数据
      onlyTableData: [],
      uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
      headersObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      // 图片预览
      previewPath: '',
      // 是否显示图片预览
      previewVisible: false
    }
  },
  mounted () {
    this.getCateList()
  },
  methods: {
    // 获取所有商品分类数据
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      this.cateList = res.data
    },
    // 级联选择器选中项变化，会触发这个函数
    handleCascaderChanged () {
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },
    // 切换标签页的时候触发这个函数
    beforeTabLeave (activeName, oldActiveName) {
      // 即将进入的标签页的名字
      // console.log(activeName)
      // 即将离开的标签页的名字
      // console.log(oldActiveName)

      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请选择商品分类!')
        return false
      }
    },
    // tab 标签被选中时触发
    async tabClicked (tab) {
      // if (tab.name === '1') {
      if (this.activeIndex === '1') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
          params: { sel: 'many' }
        })
        // console.log(res)
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        this.manyTableData = res.data
      } else if (this.activeIndex === '2') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
          params: { sel: 'only' }
        })
        // console.log(res)
        this.onlyTableData = res.data
      }
    },
    handleSuccess (response, file, fileList) {
      console.log(response)
      // console.log(file)
      // console.log(fileList)
      this.addForm.pics.push({
        pic: response.data.tmp_path
      })
    },
    // 处理图片预览效果
    handlePreview (file) {
      // console.log(file)
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    handleRemove (file, fileList) {
      // console.log(file)
      // console.log(fileList)
      const filePath = file.response.data.tmp_path
      const index = this.addForm.pics.findIndex(t => t.pic === filePath)
      this.addForm.pics.splice(index, 1)
    },
    addGoods () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return this.$message.error('请填写必要的数据')

        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')

        this.manyTableData.forEach(item => {
          this.addForm.attrs.push({
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(' ')
          })
        })
        this.onlyTableData.forEach(item => {
          this.addForm.attrs.push({
            attr_id: item.attr_id,
            attr_value: item.attr_vals
          })
        })
        console.log('form', form)

        // 可以发起添加用户的网络请求
        const { data: res } = await this.$http.post('goods', form)
        if (res.meta.status !== 201) return this.$message.error(res.meta.msg)
        this.$message.success('添加成功')
        this.$router.push('/goods')
      })
    }
  },
  computed: {
    cateId () {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>

<style lang="less" scoped>
.el-steps {
  margin: 15px 0;
}

/deep/ .el-step__title {
  font-size: 13px !important;
}

.el-checkbox {
  margin: 0 10px 0 0 !important;
}

.previewImg {
  width: 100%;
}
.addBtn {
  margin-top: 10px;
}
</style>
